JPH0455850U - - Google Patents
Info
- Publication number
- JPH0455850U JPH0455850U JP9773490U JP9773490U JPH0455850U JP H0455850 U JPH0455850 U JP H0455850U JP 9773490 U JP9773490 U JP 9773490U JP 9773490 U JP9773490 U JP 9773490U JP H0455850 U JPH0455850 U JP H0455850U
- Authority
- JP
- Japan
- Prior art keywords
- termination
- resistor
- circuit
- system bus
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
Landscapes
- Bus Control (AREA)
- Small-Scale Networks (AREA)
Description
第１図は本考案の終端自動切換え回路の一実施
例の基本構成を示す図、第２図は第１図のブロツ
クのより具体的な構成を示す図、第３図は本考案
の装置を組み込んだシステムの全体構成を示す図
、第４図は終端抵抗を必要とするデイジーチエー
ン方式のシステムバスの一般構成を示す図である
。
１……終端抵抗切換え回路、２……終端判別回
路、３……制御回路、４……電流検出回路、５…
…電圧検出回路、６……アンドゲート、７……ス
イツチ、８……終端抵抗、１１……システムバス
。
FIG. 1 is a diagram showing the basic configuration of one embodiment of the automatic termination switching circuit of the present invention, FIG. 2 is a diagram showing a more specific configuration of the blocks in FIG. 1, and FIG. 3 is a diagram showing the device of the present invention. FIG. 4 is a diagram showing the overall configuration of the incorporated system. FIG. 4 is a diagram showing the general configuration of a daisy chain type system bus that requires a terminating resistor. DESCRIPTION OF SYMBOLS 1... Termination resistance switching circuit, 2... Termination discrimination circuit, 3... Control circuit, 4... Current detection circuit, 5...
...Voltage detection circuit, 6...AND gate, 7...Switch, 8...Terminal resistor, 11...System bus.
Claims (1)
エーン方式のシステムバスの終端抵抗自動切換え
装置であつて、 終端抵抗の接続／非接続を切換える終端抵抗切
換え回路１と、 自デバイスがシステムバスの終端に位置してい
るか否かを判別する終端判別回路２と、 該終端判別回路２によりシステムバスの終端で
あることが検出されると、前記終端抵抗切換え回
路１に制御信号を出力して終端抵抗を接続させる
制御回路３とを有することを特徴とする終端抵抗
自動切換え装置。[Claims for Utility Model Registration] An automatic termination resistor switching device for a daisy chain system bus that requires a termination resistor at both ends or one end, comprising: a termination resistor switching circuit 1 for switching connection/disconnection of the termination resistor; A termination determination circuit 2 determines whether or not a device is located at the termination of the system bus; and when the termination determination circuit 2 detects that the device is at the termination of the system bus, a control signal is sent to the termination resistor switching circuit 1. A terminating resistor automatic switching device characterized in that it has a control circuit 3 which outputs and connects a terminating resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9773490U JPH0455850U (en) | 1990-09-18 | 1990-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9773490U JPH0455850U (en) | 1990-09-18 | 1990-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0455850U true JPH0455850U (en) | 1992-05-13 |
Family
ID=31838370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9773490U Pending JPH0455850U (en) | 1990-09-18 | 1990-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0455850U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619341U (en) * | 1992-08-13 | 1994-03-11 | 富士通テン株式会社 | Termination resistance prohibition circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56109055A (en) * | 1980-02-01 | 1981-08-29 | Hitachi Ltd | Data transmitter |
| JPS5753146A (en) * | 1980-08-01 | 1982-03-30 | Sundstrand Corp | Drive circuit connected to electric device connected in parallel in circuit network |
| JPH01231539A (en) * | 1988-03-11 | 1989-09-14 | Hitachi Ltd | Multi-point terminal system |
-
1990
- 1990-09-18 JP JP9773490U patent/JPH0455850U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56109055A (en) * | 1980-02-01 | 1981-08-29 | Hitachi Ltd | Data transmitter |
| JPS5753146A (en) * | 1980-08-01 | 1982-03-30 | Sundstrand Corp | Drive circuit connected to electric device connected in parallel in circuit network |
| JPH01231539A (en) * | 1988-03-11 | 1989-09-14 | Hitachi Ltd | Multi-point terminal system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619341U (en) * | 1992-08-13 | 1994-03-11 | 富士通テン株式会社 | Termination resistance prohibition circuit |
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